<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :show-icon="true" :closable="false"></el-alert>
        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange"></el-cascader>
            </el-col>
        </el-row>
        <!-- tabs页签区域 -->
        <el-tabs type="border-card" v-model="activeName" @tab-click="handleTabClick">
          <!-- 添加动态参数的面板 -->
  <el-tab-pane label="动态参数" name="many">
    <!-- 添加参数按钮 -->
    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
    <!-- 动态参数表格 -->
    <el-table :data="manyTableData" border stripe>
      <!-- 展开行 -->
      <el-table-column type="expand">
        <template slot-scope="scope">
          <!-- 循环渲染Tag标签 -->
          <el-tag type="success" v-for="(item, i) in scope.row.attr_vals" :key="i" :closable="true" @close="handleClose(i, scope.row)">
            {{item}}
          </el-tag>
          <!-- 输入的文本框 -->
          <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
          </el-input>
          <!-- 添加的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

        </template>
      </el-table-column>
      <!-- 索引列 -->
      <el-table-column type="index"></el-table-column>
      <el-table-column label="参数名称" prop="attr_name"></el-table-column>
      <el-table-column type="操作">
        <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
          </template>
      </el-table-column>
    </el-table>
  </el-tab-pane>
  <!-- 添加静态属性的面板 -->
  <el-tab-pane label="静态属性" name="only">
    <!-- 添加属性按钮 -->
    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
        <!-- 静态属性表格 -->
    <el-table :data="onlyTableData" border stripe>
      <!-- 展开行 -->
      <el-table-column type="expand">
        <template slot-scope="scope">
          <!-- 循环渲染Tag标签 -->
          <el-tag type="success" v-for="(item, i) in scope.row.attr_vals" :key="i" :closable="true" @close="handleClose(i, scope.row)">
            {{item}}
          </el-tag>
          <!-- 输入的文本框 -->
          <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
          </el-input>
          <!-- 添加的按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

        </template>
      </el-table-column>
      <!-- 索引列 -->
      <el-table-column type="index"></el-table-column>
      <el-table-column label="属性名称" prop="attr_name"></el-table-column>
      <el-table-column type="操作">
        <template slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
          </template>
      </el-table-column>
    </el-table>
  </el-tab-pane>
</el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close="addDialogClosed">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
    <!-- 修改参数的对话框 -->
        <el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close="editDialogClosed">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单验证数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }]
      },
      // 无用
      // // 控制按钮与文本框的切换与显示
      // inputVisible: false,
      // // 文本框输入的内容
      // inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 级联选择框，选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选的分类的Id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 添加监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        // ---------------
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { 
          params: { attr_sel: this.activeName } 
        })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
       const { data: res } = await this.$http.put(
         `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
         {attr_name:this.editForm.attr_name,attr_sel: this.activeName})
        if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
      this.getParamsData()
      this.editDialogVisible = false
      })
    },
    // 根据ID删除对应的参数项
    async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
        }).catch(err => err)
        // 用户取消了删除操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除')
        }
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
    },
    // 文本框失去了焦点或者按下回车都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0)
      {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
    // 如果没有return，则证明输入的内容，需要做后续处理
    row.attr_vals.push(row.inputValue.trim())
    row.inputValue= ''
    row.inputVisible = false
    // 需要发起请求，保存这次操作
    this.saveAttrVals(row)
     // console.log('ok')    
    },
    // 将对attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
    // 需要发起请求，保存这次操作
    const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
    {
      attr_name: row.attr_name,
      attr_sel: row.attr_sel,
      attr_vals: row.attr_vals.join(' ')
    })
    if (res.meta.status !== 200) {
      return this.$message.error('修改参数项失败！')
    }
    this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素呗重新渲染后，
      // 才会指定回调函数中的代码
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang='less' scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
  margin-left: 15px;
}
.input-new-tag {
  width: 150px;
  margin-left: 15px;
  margin-top: 15px;
  vertical-align: bottom;
}
.button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
  margin-top: 15px;
}
</style>
